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Renewable Energy and Hydrogen Technologies (GlobConHT), IEEE IAS Global Conference on

作者： Moumita Pramanik Hiranmay Samanta Sudipta Basu Pal Konika Das Bhattacharya Chandan Kumar Chanda Hiranmay Saha Department of Electrical Engineering(EE) Indian Institute of Engineering Science and Technology (IIEST) Shibpur Howrah India Green Energy and Sensor Systems(SAMGESS) School of Advanced Materials Indian Institute of Engineering Science and Technology(IIEST) Shibpur Howrah India Department of Computer Science Technology and Computer Science Information Technology Engineering University of Engineering and Management(UEM) Kolkata Kolkata India

The need for energy conservation and environmental protection have triggered the development and deployment of electric vehicles. Light electric vehicles and fossil fuel based light vehicles are popular means of transport for short distances in not only remote rural areas but also in places of tourist attractions. For Islands in the tropical belt like the Sunderbans in India and other pristine sea beaches in South East Asia where nature is luxuriantly present, green transportation is proposed in this work. The objective is to develop environment friendly transport for these natural havens and islands that have ample renewable resources especially in the form of solar power. In this work, a model of a light electric vehicle is developed that utilizes the solar energy during the daytime for charging its batteries. Battery charge controller inbuilt with boost based MPPT (Maximum Power Point Tracking) of solar irradiation have especially been designed to meet the requirements. The efficiency of the designed MPPT is studied. As accumulation of dust and sand reduces the solar module efficiency, an automated self-cleaning mechanism has also been designed that automatically cleans the solar panel regularly. The life cycle cost and the reduction in carbon emissions coupled with the Cost of Capital Investment and operating expenses of the developed model of green transportation far outweighs the similar values obtained from other modes of remote transportation.

关键词： Maximum power point trackers Renewable energy sources Radiation effects Costs Solar energy Fossil fuels Green transportation

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Investigation of Partially Oxidized Cu Capping Effect on CoFeB/Pt/CuOx Multilayers by electrical and Optical Methods

Investigation of Partially Oxidized Cu Capping Effect on CoF...

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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Yuteng Ma Nan Zhang Hang Xie Lin Ke Yihong Wu Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore National University of Singapore (Chong Qing) Research Institute Chongqing China Institute of Materials Research and Engineering Agency for Science Technology and Research Singapore Singapore

ISBN: (数字)9798350362213

ISBN: (纸本)9798350362220

Orbital Hall effect in light metals has attracted attentions recently, but research on the orbital Rashba-Edelstein effect and its inverse effect is relatively limited. In this study, we experimentally demonstrate the existence of both effects in CoFeB/Pt/CuOx multilayers. By conducting spin Hall magnetoresistance (SMR) and anisotropic magneto resistance (AMR) measurements simultaneously and calculating the ratio between them, we rule out the current shunt effect and conclude the surface oxidized Cu film contributes to the generation of orbital Hall currents, and these orbital Hall currents exhibit the same polarization as the spin currents generated by Pt. Our argument is further substantiated by the THz emission measurements which show that the effective spin diffusion length in Pt increases from 3.57 nm to 4.37 nm with the addition of CuOx. Our work provides further evidence to the hypothesis of interface related charge-orbital interconversion.

关键词： Magnetic multilayers Stimulated emission Current measurement Surface resistance Length measurement Nonhomogeneous media Extraterrestrial measurements

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On the Reliability of High-Performance Dual Gate (DG) W-Doped In2O3 FET

On the Reliability of High-Performance Dual Gate (DG) W-Dope...

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Symposium on VLSI Technology

作者： Khandker Akif Aabrar Hyeonwoo Park Sharadindu G. Kirtania Eknath Sarkar Md Abdullah Al Mamun Sunbin Deng Chengyang Zhang Gilbert B. Rayner Kyeongjae Cho Suman Datta School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia USA Department of Materials Science and Engineering University of Texas at Dallas Richardson TX USA Kurt J. Lesker Company Jefferson Hills Pennsylvania

ISBN: (数字)9798350361469

ISBN: (纸本)9798350361476

We demonstrate a high performance back-end-of-line (BEOL) compatible tungsten (W)-doped In 2 O 3 channel (IWO) dual gate (DG) field-effect transistor (FET) with ultra low-leakage current $<10^{-15}\ \ \mathrm{A}/\mu \mathrm{m}$ and high $\mathrm{I}_{\text{ON}}/\mathrm{I}_{\text{OFF}}$ ratio of $5.8\times 10^{11}$ at 2.5V overdrive $(\mathrm{V}_{\text{ov}})$ . In addition, the IWO DG FET demonstrates a record low negative bias temperature instability (NBTI) of 7.2mV, record low hot carrier degradation (HCD) of 63mV and a low positive bias temperature instability (PBTI) of 85mV at 1V $\mathrm{V}_{\text{ov}}$ which makes IWO DG FET a potential candidate for realizing high density embedded-DRAM for last-level cache (LLC). Furthermore, we develop a comprehensive modeling framework for assesing the reliability of amorphous oxide semiconductor (AOS) channel FETs which can provide insights into the threshold voltage $(\mathrm{V}_{\mathrm{T}})$ instability mechanisms and help design appropriate mitigation strategies.

关键词： Negative bias temperature instability Electron traps Thermal variables control Prevention and mitigation Impurities Field effect transistors Ionization

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Fully-Printed Sensor Based Extended Gate Field Effect Transistors for Wireless Monitoring of Potassium and Ammonium Ions

Fully-Printed Sensor Based Extended Gate Field Effect Transi...

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IEEE SENSORS

作者： Munia Ferdoushi Mohammad Shafiqul Islam Wenxin Cai Sandra Lara Galindo Md Farhad Hassan Yasser Khan Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los Angeles California Department of Chemical Engineering and Materials Science University of Southern California Los Angeles California Alfred E. Mann Department of Biomedical Engineering University of Southern California Los Angeles California

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

This paper presents an extended gate field effect transistor based ion sensing platform utilizing flexible printed ion selective electrodes. A custom-printed circuit board with a Bluetooth-enabled microcontroller module enables wireless monitoring of the transistor's transfer characteristics modulated by the ion concentration in the target solution. The utilization of printing techniques such as inkjet printing and direct 3D writing provide the scope for facile and cost-effective fabrication. The system has been utilized for remote monitoring of Potassium and Ammonium ions with ideal Nernstian response, high sensitivity, and selectivity. This work provides a promising path for real-time and continuous ion monitoring which has crucial implications for health, industry, and environmental applications.

关键词： Wireless communication Wireless sensor networks Sensitivity Field effect transistors Logic gates Writing Ions Three-dimensional printing Sensors Potassium

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Multi-fidelity Bayesian optimization with multiple information sources of input-dependent fidelity 24

Multi-fidelity Bayesian optimization with multiple informati...

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Proceedings of the Fortieth Conference on Uncertainty in Artificial Intelligence

作者： Mingzhou Fan Byung-Jun Yoon Edward Dougherty Nathan Urban Francis Alexander Raymundo Arróyave Xiaoning Qian Department of Electrical & Computer Engineering Texas A&M University College Station Texas Department of Electrical & Computer Engineering Texas A&M University College Station Texas and Computational Science Initiative Brookhaven National Laboratory Upton New York Computational Science Initiative Brookhaven National Laboratory Upton New York Argonne National Laboratory Lemont Illinois Department of Materials Science & Engineering Texas A&M University College Station Texas and Department of Mechanical Engineering Texas A&M University College Station Texas Department of Electrical & Computer Engineering Texas A&M University College Station Texas and Computational Science Initiative Brookhaven National Laboratory Upton New York and Department of Computer Science & Engineering Texas A&M University College Station Texas

By querying approximate surrogate models of different fidelity as available information sources, Multi-Fidelity Bayesian Optimization (MFBO) aims at optimizing unknown functions that are costly if not infeasible to evaluate. Existing MFBO methods often assume that approximate surrogates have consistently high/low fidelity across the input domain. However, approximate evaluations from the same surrogate can have different fidelity at different input regions due to data availability and model constraints, especially when considering machine learning surrogates. In this work, we investigate MFBO when multi-fidelity approximations have input-dependent fidelity. By explicitly capturing input dependency for multi-fidelity queries in Gaussian Process (GP), our new input-dependent MFBO (iMFBO) with learnable noise models better captures the fidelity of each information source in an intuitive way. We further design a new acquisition function for iMFBO and prove that the queries selected by iMFBO have higher quality than those by naive MFBO methods, with the derived sub-linear regret bound. Experiments on both synthetic and real-world data demonstrate its superior empirical performance.

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Subwavelength-Engineered Antislot Photonic Crystals in a Silicon Photonics Foundry for On-chip Communications

Subwavelength-Engineered Antislot Photonic Crystals in a Sil...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Kellen P. Arnold Joshua A. Allen Sami I. Halimi Landen D. Ryder Francis O. Afzal Yusheng Bian Abdelsalam Aboketaf Takako Hirokawa Kevin Dezfulian Michal Rakowski Rod Augur Karen Nummy Sharon M. Weiss Interdisciplinary Materials Science Program Vanderbilt University Nashville TN USA Department of Electrical and Computer Engineering Vanderbilt University Nashville TN USA NASA Goddard Space Flight Center Greenbelt MD US GlobalFoundries Malta NY USA

We report scalable foundry fabrication and characterization of photonic crystal nanobeam waveguides incorporating subwavelength-scale dielectric antislot unit cells. This work enables enhanced light-matter interaction... 详细信息

ISBN: (纸本)9798350369311

关键词： Mach-Zehnder interferometers Optical device fabrication Photonic crystals Waveguide lasers Lasers and electrooptics Electro-optic modulators Silicon photonics Foundries System-on-chip Electro-optical waveguides

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LTE/WI-FI COEXISTENCE ON A FLEXIBLE SOFTWARE DEFINED RADIO TESTBED 57

LTE/WI-FI COEXISTENCE ON A FLEXIBLE SOFTWARE DEFINED RADIO T...

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57th Annual International Telemetering Conference, ITC 2022

作者： Elahi, Mirza M. Valdez, Kevin J. Gonzalez, Virgilio Computational Science Program The University of Texas at El Paso El PasoTX79968 United States Department of Electrical and Computer Engineering The University of Texas at El Paso El PasoTX79968 United States

The rapid rise in usage of mobile devices have not shown any signs of flattening or slowing down. Some efforts in the standardization bodies are underway to define new ways to boost data rate, network capacity and lower the latency by enhancing existing 4G technologies and by incorporating new technologies in 5G. Since lower spectrum has fewer resources, the LTE of unlicensed spectrum LTE-U is being proposed to extend LTE to unlicensed spectrum. Streaming data traffic for licensed spectrum on LTE-U can improve the performance of the system significantly. In this paper LTE-U deployment by the LAA is implemented using the LBT mechanism on a flexible SDR testbed. © 2022 International Foundation for Telemetering. All rights reserved.

关键词： Testbeds

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Realization of high aspect ratio metalenses by facile nanoimprint lithography using water-soluble stamps

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PhotoniX 2023年第1期4卷 382-392页

作者： Hojung Choi Joohoon Kim Wonjoong Kim Junhwa Seong Chanwoong Park Minseok Choi Nakhyun Kim Jisung Ha Cheng-Wei Qiu Junsuk Rho Heon Lee Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea ZERC Seoul 02841Republic of Korea

Nanoimprint lithography(NIL)has attracted attention recently as a promising fabrication method for dielectric metalenses owing to its low cost and high throughput,however,high aspect ratio(HAR)nanostructures are required to manipulate the full 2πphase of *** NIL using a hard-polydimethylsiloxane(h-PDMS)mold inevitably incurs shear stress on the nanostructures which is inversely proportional to the surface area parallel to the direction of ***,HAR structures are subjected to larger shear stresses,causing structural ***,we propose a novel wet etching NIL method with no detachment process to fabricate flawless HAR *** water-soluble replica mold is fabricated with polyvinyl alcohol(PVA)which is simpler than an h-PDMS mold,and the flexibility of the PVA mold is suitable for direct printing as its high tensile modulus allows high-resolution patterning of HAR *** diffraction-limited focusing of the printed metalenses demonstrates that it operates as an ideal lens in the visible *** method can potentially be used for manufacturing various nanophotonic devices that require HAR nanostructures at low cost and high throughput,facilitating commercialization.

关键词： Nanoimprint lithography Wet etching Polyvinyl alcohol High fidelity nanofabrication High aspect ratio nanostructure Metalens

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RATE-DEPENDENT TRACTION LAW FOR GLASS FIBER-EPOXY INTERPHASE DEVELOPED USING MOLECULAR SIMULATIONS

RATE-DEPENDENT TRACTION LAW FOR GLASS FIBER-EPOXY INTERPHASE...

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SAMPE 2022 Conference and Exhibition

作者： Chowdhury, Sanjib C. Gillespie, John W. University of Delaware NewarkDE19716 United States Department of Materials Science & Engineering University of Delaware NewarkDE19716 United States Department of Civil & Environmental Engineering University of Delaware NewarkDE19716 United States Department of Mechanical Engineering University of Delaware NewarkDE19716 United States Department of Electrical and Computer Engineering University of Delaware NewarkDE19716 United States

ISBN: (纸本)9781934551417

Impact loading of composites subjects the constituents such as the nanometer scale interphase to high strain loading that can cause fiber-matrix debonding. In multi-scale modeling, interphase debonding is modeled using the interphase traction-separation laws. In this paper, we develop strain rate dependent Mode-I traction law for the glass fiber-epoxy interphase using all-atom molecular dynamics (MD) simulation. The interphase model is prepared considering monolayer glycidoxypropyltrimethoxy silane (GPS) in between the glass surface and epoxy matrix using our developed protocol [Chowdhury et al. Applied Surface science 2021, 542:148738]. Traction laws are developed over a full range of strain rates from quasi-static to super-high strain rate (~ 1e16/s) where a theoretical plateau strength limit is predicted. A stress-relaxation methodology is introduced to construct quasi-static traction-separation responses from high strain rate loading. Simulation results reveal that the interphase traction-separation responses are strain rate dependent. Variations of peak traction and energy with strain rates show a characteristic S-shape pattern in a semi-log plot with a gradual increase in properties up to 1e12/s where a steep transition occurs between 1e13/s to 1e14/s followed by a strain rate independent plateau. MD predicted traction and energy are fitted with mathematical correlations to use them in the finite element-based continuum level micro-mechanics modeling to bridge the length scale for multi-scaling. Copyright 2022. Used by the Society of the Advancement of Material and Process engineering with permission.

关键词： Strain rate

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Crystallization of the transdimensional electron liquid

arXiv

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arXiv 2025年

作者： Bondarev, Igor V. Boltasseva, Alexandra Khurgin, Jacob B. Shalaev, Vladimir M. Department of Mathematics & Physics North Carolina Central University DurhamNC27707 United States Elmore Family School of Electrical & Computer Engineering Purdue Quantum Science & Engineering Institute Birck Nanotechnology Center West LafayetteIN47907 United States School of Materials Engineering Purdue University West LafayetteIN47907 United States Department of Electrical & Computer Engineering Whiting School of Engineering Johns Hopkins University BaltimoreMD21218 United States

By calculating the critical densities, temperatures and phase diagrams, we show that metallic transdimensional materials are unique in that by simply reducing their thickness one can Wigner crystallize their free electrons at room temperature. When it occurs, the electrons get pinned on a two-dimensional periodic triangular lattice to form an electron super-solid (electron solid inside of a crystalline material). Such a solid melts and gets frozen back with raising and lowering the temperature, respectively, and its resistivity behaves opposite to the free electron gas model predictions. © 2025, CC BY.

关键词： Crystalline materials

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